MCi Crusader II 1989 Maintenance Manual page 302

Date
Page·_. __
8 ·_ 6 _ _
MC-9 MAINTENANCE MANUAL
Figure 8-9. Idle Speed Adjustment.
25. Recheck the maximum no-load speeds. If increased
more than 25 rpm, back off the fast idle cylinder until the
increase is less than 25 rpm.
TWO SPEED GOVERNOR HIGH SPEED
SPRING REPLACEMENT
HT.- 7 40 automatic transmissions may not shift from third to
,ourth gear under full throttle if the high speed spring in the two
speed governor has "taken a ·set."_ When this occurs. the
engine maximum no-load speed may bereducedtoaffectthe
full-throttle upshift from third to fourth.
No transmission problems are associated with this condi-
tion. If engine maximum no-load speed is less than the recom-
mended 2250 RPM, the new high speed spring will increase the
speed.
New springs can be ordered from Detroit Diesel Allison, part
number 23501874. The replacement springs are color coded
with red and brown paint on one side of the spring. •
Read the entire procedure before starting.
1 Refer to figure 8-10. Disconnect the air line to the two-
speed governor housing.
2. Cut and remove the lock wire that is routed through the
mounting capscrews and low maximum no-load adjusting
screw.
CAPS CREWS
CAUTION: Exercise care in removing the
spring housing so that the mounting gaskets
are not damaged.
3. Remove the two capscrews mounting the housing to gov-
ernor and remove the housing. Keep the internal parts within
the housing when removing the housing from the governor.
4. Remove any cylinders and/ or auxiliary devices mounted
on the governor cover.
5. Remove the eight cover screws and lift the governor
cover, with the stop lever and cover gaskets, from the governor.
CAUTION: The retainer to be removed in
Step 6 is under spring tension from inside
the governor. Use adequate counter-force
when removing it to prevent the expulsion
of parts due to internal spring pressure.
6. Referto figure 8-8. Remove the spring re1ainerfrom the governor
governor by rotating it counterclockwise. Use DOA special tool
J-1652-01.
7. Refer to figure 8-8. Remove the two-speed governor
spring assembly from inside the governor. Keep the parts intact
as you guid~ them through the hole in the governor wall.
8. Disassemble the parts necessary to isolate and remove
the high-speed spring. Do not change the location of the lock
nut on the set screw.
9. Replace the old spring. Check that the color code on the
new spring is red and brown.
10. Reassemble the parts. Make sure the adjusting pin seats
properly in the plunger (figure 8-8). Insert the assembly through
the hole and into position inside the governor.
11. Place the retainer over the spring and compress it to start
the threads into the hole of the governor. Tighten the retainer
securely.
12. Install a new gasket P/N 8924869 and reinstall the gov-
ernor cover with the eight bolts.
13. Install the spring housing with the gaskets on the gover-
nor. Connect the air line.
NOTE: Replacing the high speed spring
may change the settings of the Governor
Gap, Injector Rack Control Levers, Maxi-
mum No-Load Engine Speed, Idle Speed
and Buffer Screw. Refer to section 14 o1 the
applicable ODA engine maintenance man-
ual to adjust the above items.